Unfortunately I can't reproduce a fix using your patch (i.e your patch does not fix anything). I am using a stripped radio version of GTASA, though. I'll try and re-test with full radio.

Interestingly, both before and after applying this patch, the following problem occurs:

setRadioChannel breaks stadium audio

1. Start game afresh, and join server
2. crun setRadioChannel(9) (this does not work, except that the radio plays for like 250ms)
3. Go to a stadium and observe that the regular stadium audio does not work. normally it does play - this only happens because you tried crun setRadioChannel(9). (note that this also happens in other audio interiors, like the shamal)
4. go to "outside", try to play radio, and note that step 2 still occurs
5. go back to the stadium and note that step 3 still occurs
6. spawn a vehicle in the stadium
7. when you click enter, the audio will work again
8. leave the vehicle, go "outside", and now crun setRadioChannel(9) will work

Thanks for testing. There appears to be two issues, the latter being that once you start the radio (call to StartRadio), it will keep the radio on until you manually turn it off. I could try making it so that once you enter an area with an ambience track, it will stop the radio automatically and hence enables the ambience track. The fact that the radio doesn't turn on is weird, I'll test around a bit more. Where did you spawn? Is it the Steam version or some other version? I'm wondering if this has to do with some wrong offsets like with the radio class we had to do some tweaking.

Is it the Steam version or some other version?

b0cf9fb580ff473b1fdefc7b7617059d *gta_sa.exe I think it's nocd 1.0

Where did you spawn?

Happens with play's pirate ship spawn, as well as Easter Bay Airport in San Fierro.

Adding back the radio music to the streams folder makes this patch work. Do you think you can still fix it when you have no music?

To remove radio make sure your audio/streams folder looks like this:

Odd, I can't seem to reproduce that issue even without those files.

I am no longer committed to working this issue so I'm closing this PR. Hopefully some of the work could be of use to someone else in the future.